Appel will almost assuredly not open the season with the Astros, but could make his major league debut at some point this year.
"I haven't moved on the ankle in a while, so this is different," said Davis, who will continue to wear a protective boot. "There's not a lot of pain, though. Once again, it's just a little tight, I guess, but not painfully tight.
"It's not the same. I think it's more the fact I just haven't used my Achilles tendons in a while. You have to go get them stretched out again."
Calhoun earned a starting spot this season after batting .282 with a .462 slugging percentage in 195 at-bats in 2013.
Choo is off to a slow start with his new team. He is batting just .176 in 17 at-bats with a double.
"He's very close to game-ready," manager Bryan Price said.
A lack of control could keep
Gausman was chucking his fastball at nearly 100 miles an hour in his last start, but has yet to throw his breaking ball for strikes, which could result in him being groomed as a short reliever. He walked just 13 in 47 2/3 innings a year ago, but his 5.66 ERA indicated a lack of an effective variety in his pitch selection.
The Orioles' inability to sign free agent pitcher Ervin Santana is good news for Gausman, but he could still wind up at Triple-A Norfolk.